<!-- 父级组件:控制除登录页以外所有页面的共有头部与左侧菜单栏 -->
<template>
  <div style="display: flex;">
    <div :style="{width:(isCollapse ? '64px' : '208px')}">
      <!-- 左侧菜单栏 -->
      <el-menu
          background-color="#3C82F5"
          style="width: 100%;height: 100vh;"
          text-color="#fff"
          active-text-color="#ff0"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
      >
        <!-- 左侧菜单栏顶部条 -->
        <el-row style="padding-top: 10px;">
          <el-col :span="2"></el-col>
          <el-col :span="7" style="padding-left: 8px;">
            <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse ? 0 : 13">
            <span style="color:#fff;font-weight: bold;position:relative;top:8px;left:2px;">智慧车辆</span>
          </el-col>
        </el-row>
        <el-sub-menu index="1">
          <template #title>
            <el-icon style="font-size:21px;"><User/></el-icon>
            <span>用户管理</span>
          </template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title>
            <el-icon style="font-size:21px;"><Van/></el-icon>
            <span>车辆管理</span>
          </template>
          <el-menu-item index="/vehicle">车辆列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title>
            <el-icon style="font-size:21px;"><Location/></el-icon>
            <span>围栏管理</span>
          </template>
          <el-menu-item index="/geofence">电子围栏</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title>
            <el-icon style="font-size:21px;"><Place/></el-icon>
            <span>调度管理</span>
          </template>
          <el-menu-item index="/application">用车申请</el-menu-item>
          <el-menu-item index="/audit">用车审批</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title>
            <el-icon style="font-size:21px;"><MessageBox/></el-icon>
            <span>字典管理</span>
          </template>
          <el-menu-item index="/dict">字典列表</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <div :style="{width:(isCollapse ? 'calc(100% - 64px)' : 'calc(100% - 208px)')}">
      <!--  右侧顶部条:折叠图标+登录用户名+退出登录  -->
      <el-header style="height:10vh;background-color:#fff;padding-top:22px;">
        <el-row>
          <el-col :span="18">
            <el-icon style="font-size: 21px;" @click="changeCllopsed"><Expand/></el-icon>
          </el-col>
          <el-col :span="6" style="position: relative;">
            <el-dropdown trigger="click" style="position: absolute;right:20px;">
              <span style="font-size:19px;font-weight:bold;">
                {{user.username}}
                <el-icon><arrow-down/></el-icon>
              </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!-- 右侧顶部条:面包屑导航 -->
        <el-breadcrumb separator="/" style="position:relative;top:20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadcrumb">{{item}}</el-breadcrumb-item>
          <!--          <el-breadcrumb-item>用户管理</el-breadcrumb-item>-->
          <!--          <el-breadcrumb-item>用户列表</el-breadcrumb-item>-->
        </el-breadcrumb>
      </el-header>
      <el-main style="height: 90vh;padding: 0;overflow-y: auto;">
        <!--  右侧可变区域 -->
        <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>
import {onMounted, ref} from "vue";
import {useRoute, useRouter} from "vue-router";

//定义变量用来控制左侧菜单栏是否折叠
const isCollapse = ref(false);
//定义处理左侧菜单栏折叠的方法
const changeCllopsed = () => {
  isCollapse.value = !isCollapse.value;
}
//获取当前登录的用户数据
const user = ref(getUser());
//定义退出登录的方法
const logout = () => {
  if(confirm('您确认要退出登录吗?')){
    localStorage.removeItem('user');
    //跳转到登录页面
    window.location.href = '/login';
    //清空取出来的user对象数据
    user.value = '';
  }
}
//定义数组用来保存当前面包屑导航显示的值
const breadcrumb = ref([]);
//定义对象用来保存 path 与 面包屑值 的对应关系
let map = {
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','车辆列表'],
  '/geofence':['围栏管理','电子围栏'],
  '/application':['调度管理','申请列表'],
  '/audit':['调度管理','调度审核'],
  '/distribute':['调度管理','用车分配'],
  '/dict':['字典管理','字典列表']
};
//useRoute()是Vue-router提供的一个方法，用于获取当前路由对象
const route = useRoute();
//自定义更新面包屑值的方法
const updateBreadcrumb = (route) => {
  //从当前路由对象中获取当前的路径path
  const path  = route.path;
  //根据path更新面包屑显示的值
  breadcrumb.value = map[path];
}
//一进入页面就立即调用更新面包屑导航值的函数,只有在第一次进入页面时会调用
onMounted(()=>{
  updateBreadcrumb(route);
})
//获取路由守卫,监听路由,只要path发生了改变(包含点击左侧菜单栏),就立即更新面包屑
const router = useRouter();
router.beforeEach((to,from,next)=>{
  updateBreadcrumb(to);
  next();
})

</script>